[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Pablo Galindo Salgado added the comment: New changeset e51dd9dad6590bf3a940723fbbaaf4f64a3c9228 by Pablo Galindo in branch 'master': bpo-29727: Register array.array as a MutableSequence (GH-21338) https://github.com/python/cpython/commit/e51dd9dad6590bf3a940723fbbaaf4f64a3c9228 --

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Change by Pablo Galindo Salgado : -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker ___

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Change by Pablo Galindo Salgado : -- keywords: +patch nosy: +pablogsal nosy_count: 5.0 -> 6.0 pull_requests: +20486 stage: needs patch -> patch review pull_request: https://github.com/python/cpython/pull/21338 ___ Python tracker

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Changes by Ivan Levkivskyi : -- assignee: -> levkivskyi stage: -> needs patch ___ Python tracker ___

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Guido van Rossum added the comment: I'm with Raymond. I propose to register array.array() in all the appropriate places and then close this bug as a won't fix. The typing issue might eventually be resolved via PEP 544 (if accepted), or not -- the"fallback protocols" based on __getitem__ and

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Changes by Raymond Hettinger : -- assignee: rhettinger -> ___ Python tracker ___

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Changes by Ivan Levkivskyi : -- nosy: +levkivskyi ___ Python tracker ___ ___

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Raymond Hettinger added the comment: One other thought: array.array() object should probably be registered so that it recognizable as a Sequence and as Reversible. -- ___ Python tracker

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

Raymond Hettinger added the comment: I don't think this is a bug. The purpose collections.abc.Reversible is to recognize type where the behavior has been guaranteed, not to recognize all types where it happens to work. Part of the original reason for introducing ABCs in the first place was

[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

New submission from Serhiy Storchaka: collections.abc.Reversible doesn't work with types that are supported by reserved() but neither have the __reversed__ method nor are explicitly registered as collections.abc.Sequence. For example: >>> issubclass(array.array, collections.abc.Reversible)